/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/**
 * @author Alexander Y. Kleymenov
 */

package org.apache.harmony.security.x509;

import java.io.IOException;

import javax.security.auth.x500.X500Principal;

import org.apache.harmony.security.asn1.ASN1Choice;
import org.apache.harmony.security.asn1.ASN1Implicit;
import org.apache.harmony.security.asn1.ASN1Type;
import org.apache.harmony.security.asn1.BerInputStream;
import org.apache.harmony.security.x501.Name;

/**
 * The class encapsulates the ASN.1 DER encoding/decoding work with the
 * DistributionPointName structure which is the part of X.509 CRL (as specified
 * in RFC 3280 - Internet X.509 Public Key Infrastructure. Certificate and
 * Certificate Revocation List (CRL) Profile.
 * http://www.ietf.org/rfc/rfc3280.txt):
 * 
 * <pre>
 *  CRLDistributionPoints ::= SEQUENCE SIZE (1..MAX) OF DistributionPoint
 * 
 *  DistributionPoint ::= SEQUENCE {
 *        distributionPoint       [0]     DistributionPointName OPTIONAL,
 *        reasons                 [1]     ReasonFlags OPTIONAL,
 *        cRLIssuer               [2]     GeneralNames OPTIONAL 
 *  }
 * 
 *  DistributionPointName ::= CHOICE {
 *        fullName                [0]     GeneralNames,
 *        nameRelativeToCRLIssuer [1]     RelativeDistinguishedName 
 *  }
 * 
 *  ReasonFlags ::= BIT STRING {
 *        unused                  (0),
 *        keyCompromise           (1),
 *        cACompromise            (2),
 *        affiliationChanged      (3),
 *        superseded              (4),
 *        cessationOfOperation    (5),
 *        certificateHold         (6),
 *        privilegeWithdrawn      (7),
 *        aACompromise            (8) 
 *  }
 * </pre>
 */
public class DistributionPointName {

	private final GeneralNames fullName;
	private final Name nameRelativeToCRLIssuer;

	public static final ASN1Choice ASN1 = new ASN1Choice(new ASN1Type[] {
			new ASN1Implicit(0, GeneralNames.ASN1),
			new ASN1Implicit(1, Name.ASN1_RDN) }) {

		@Override
		protected Object getDecodedObject(BerInputStream in) throws IOException {
			DistributionPointName result = null;
			if (in.choiceIndex == 0) {
				result = new DistributionPointName((GeneralNames) in.content);
			} else {
				// note: ASN.1 decoder will report an error if index
				// is neither 0 or 1
				result = new DistributionPointName((Name) in.content);
			}
			return result;
		}

		@Override
		public int getIndex(java.lang.Object object) {
			final DistributionPointName dpn = (DistributionPointName) object;
			return (dpn.fullName == null) ? 1 : 0;
		}

		@Override
		public Object getObjectToEncode(Object object) {
			final DistributionPointName dpn = (DistributionPointName) object;
			if (dpn.fullName == null) {
				return dpn.nameRelativeToCRLIssuer;
			} else {
				return dpn.fullName;
			}
		}
	};

	public DistributionPointName(GeneralNames fullName) {
		this.fullName = fullName;
		nameRelativeToCRLIssuer = null;
	}

	public DistributionPointName(Name nameRelativeToCRLIssuer) {
		fullName = null;
		this.nameRelativeToCRLIssuer = nameRelativeToCRLIssuer;
	}

	/**
	 * Places the string representation of extension value into the StringBuffer
	 * object.
	 */
	public void dumpValue(StringBuffer buffer, String prefix) {
		buffer.append(prefix);
		buffer.append("Distribution Point Name: [\n"); //$NON-NLS-1$
		if (fullName != null) {
			fullName.dumpValue(buffer, prefix + "  "); //$NON-NLS-1$
		} else {
			buffer.append(prefix);
			buffer.append("  "); //$NON-NLS-1$
			buffer.append(nameRelativeToCRLIssuer
					.getName(X500Principal.RFC2253));
		}
		buffer.append(prefix);
		buffer.append("]\n"); //$NON-NLS-1$
	}
}
